This tester verifies that a European type mains outlet socket is wired properly and grounded.

It should be stressed that even if your outlet socket were wired improperly, there is no danger of electrocution when using Groundology equipment, because our products have built in safety protection. However, if your outlet socket is not wired properly then you would not get the benefits of grounding.

Please note that some older houses in Norway and some parts of Belgium use the "IT" mains earthing system. While the "IT" system is suitable to use with our products, the socket tester is not able to verify the earth in this case (it will show "No Earth"). If you live in Norway or Belgium and are not sure if your house is earthed, then please check with a local electrician.